Question

poisonous proteins released by pathogenic bacteria

Answer 1

Exotoxins are usually secreted by living bacteria during exponential growth. The production of the toxin is generally specific to a particular bacterial species that produces the disease associated with the toxin (e.g. only Clostridium tetani produces tetanus toxin; only Corynebacterium diphtheriae produces the diphtheria toxin). Usually, virulent strains of the bacterium produce the toxin while nonvirulent strains do not, and the toxin is the major determinant of virulence (e.g. tetanus and diphtheria). At one time, it was thought that exotoxin production was limited mainly to Gram-positive bacteria, but clearly both Gram-positive and Gram-negative bacteria produce soluble protein toxins.

Answer 2

Many pathogenic bacteria colonize mucosal sites by using pili ( fimbriae) to adhere the cells.
....Exotoxins: Exotoxins include several types of protein toxins and enzyme produced and secreted from pathogenic bacteria. Major categories include cytotoxin, neurotoxin and entrotoxin.